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31 .\" From: @(#)linkaddr.3 8.1 (Berkeley) 7/28/93
32 .\" $FreeBSD: src/lib/libc/net/linkaddr.3,v 1.16 2007/02/28 21:18:38 bms Exp $
33 .\" $DragonFly: src/lib/libc/net/linkaddr.3,v 1.3 2008/11/23 21:55:52 swildner Exp $
41 .Nd elementary address specification routines for link level access
49 .Fn link_addr "const char *addr" "struct sockaddr_dl *sdl"
51 .Fn link_ntoa "const struct sockaddr_dl *sdl"
55 interprets character strings representing
56 link-level addresses, returning binary information suitable
57 for use in system calls.
62 address and returns an
64 string representing some of the information present,
65 including the link level address itself, and the interface name
66 or number, if present.
67 This facility is experimental and is
68 still subject to change.
75 an optional network interface identifier of the form
76 .Dq "name unit-number" ,
77 suitable for the first argument to
79 followed in all cases by a colon and
80 an interface address in the form of
81 groups of hexadecimal digits
83 Each group represents a byte of address;
84 address bytes are filled left to right from
85 low order bytes through high order bytes.
87 .\" A regular expression may make this format clearer:
88 .\" .Bd -literal -offset indent
89 .\" ([a-z]+[0-9]+:)?[0-9a-f]+(\e.[0-9a-f]+)*
94 represents an ethernet address
95 to be transmitted on the first Lance ethernet interface.
100 always returns a null terminated string.
114 functions appeared in
117 The returned values for
119 reside in a static memory area.
123 should diagnose improperly formed input, and there should be an unambiguous
124 way to recognize this.
128 field of the link socket address
132 will not insert a colon before the interface address bytes.
133 If this translated address is given to
135 without inserting an initial colon,
136 the latter will not interpret it correctly.